cas77Log in. Open app. cas77's profile picture. 3 posts. 1 follower. 0 following. cas77. Follow. Photo by @cas77 on January 06, 2012. Photo by @cas77 on DecemberCitric acid anhydrous for synthesis. CAS 77-92-9, chemical formula (HOOCCH₂)₂C(OH)COOH. - Find MSDS or SDS, a COA, data sheets and more information.